full transcript
"From the Ted Talk by Allan Adams: What the discovery of gravitational waves means"

#### Unscramble the Blue Letters

So the trouble with gravitational waves is that they're very weak; they're preposterously weak. For example, the waves that hit us on September 14 â and yes, every single one of you stretched and compressed under the action of that wave â when the waves hit, they stretched the average prsoen by one part in 10 to the 21. That's a decimal place, 20 zeroes, and a one. That's why everyone thought the LIGO people were nuts. Even with a lesar dcoetetr five kilometers long â and that's already crazy â they would have to measure the legtnh of those dtteorecs to less than one thousandth of the radius of the nceuuls of an atom. And that's preposterous.

#### Open Cloze

So the trouble with gravitational waves is that they're very weak; they're preposterously weak. For example, the waves that hit us on September 14 â and yes, every single one of you stretched and compressed under the action of that wave â when the waves hit, they stretched the average **______** by one part in 10 to the 21. That's a decimal place, 20 zeroes, and a one. That's why everyone thought the LIGO people were nuts. Even with a **_____** **________** five kilometers long â and that's already crazy â they would have to measure the **______** of those **_________** to less than one thousandth of the radius of the **_______** of an atom. And that's preposterous.

#### Solution

- detectors
- laser
- person
- detector
- nucleus
- length

#### Original Text

So the trouble with gravitational waves is that they're very weak; they're preposterously weak. For example, the waves that hit us on September 14 â and yes, every single one of you stretched and compressed under the action of that wave â when the waves hit, they stretched the average person by one part in 10 to the 21. That's a decimal place, 20 zeroes, and a one. That's why everyone thought the LIGO people were nuts. Even with a laser detector five kilometers long â and that's already crazy â they would have to measure the length of those detectors to less than one thousandth of the radius of the nucleus of an atom. And that's preposterous.
#### ngrams of length 2

collocation |
frequency |

black holes |
11 |

gravitational waves |
9 |

big bang |
4 |

gravitational wave |
3 |

#### Important Words

- action
- atom
- average
- compressed
- crazy
- decimal
- detector
- detectors
- gravitational
- hit
- kilometers
- laser
- length
- ligo
- long
- measure
- nucleus
- nuts
- part
- people
- person
- place
- preposterous
- preposterously
- radius
- september
- single
- stretched
- thought
- thousandth
- trouble
- wave
- waves
- weak
- zeroes